论文标题
完全吸收镜子对称的声学元素
Perfect absorption in mirror-symmetric acoustic metascreens
论文作者
论文摘要
在这项工作中，在理论上和实验上报告了与入射侧无关的镜像声学元素，从而产生完美的吸收。 Metascreen支持对称和反对称共振的镜子对称共振构建块，可以调节为相同的频率（退化共振）。优化了构建块的几何形状，以与相同频率的对称性和反对称共振进行批判性，从而从元中的两侧吸收了声音。开发了基于转移矩阵方法和外部声场的模态分解的杂种分析模型，以分析元赛的散射特性。所得的几何形状是3D打印的，并在阻抗管中进行了实验测试。实验结果与理论预测非常吻合，这证明了这些元素元素在通风问题中完全吸收声音的效率。
Mirror-symmetric acoustic metascreens producing perfect absorption independently of the incidence side are theoretically and experimentally reported in this work. The mirror-symmetric resonant building blocks of the metascreen support symmetric and antisymmetric resonances that can be tuned to be at the same frequency (degenerate resonances). The geometry of the building blocks is optimized to critically couple both the symmetric and the antisymmetric resonances at the same frequency allowing perfect absorption of sound from both sides of the metascreen. A hybrid analytical model based on the transfer matrix method and the modal decomposition of the exterior acoustic field is developed to analyze the scattering properties of the metascreen. The resulting geometry is 3D printed and experimentally tested in an impedance tube. Experimental results agree well with the theoretical predictions proving the efficiency of these metascreens for the perfect absorption of sound in the ventilation problems.
